Dynamo electric machine armature



1931- v. 6. PPLE ,3 23

DYNAMO ELECTRIC MACHINE ARMATURE Filed NOV. 23, 1927 2 Sheets-Sheet l IN V EN TOR.

- Dec. 8, 1931. v. G. APPLE 1,334,923

I I DYNAMO ELECTRIC MACHINE ARMATURE Filed Nov. 25, 1927 2 Sheets-Sheet 2 Fig.5:

, INVENTOR.

Patented Dec. 8, 1931 mm [STATES vrncnnr earns, or DAYTON, enro jDYNAivlo ELEoTRIc MAeHInE ARMATURE.

Application filed November 23, 1927. se ial no. 235,281.

This invention relates to improvements in thattype of armatures having two'sep'arate .and distinct, windings either of which may produce or receive current independently of the other. One of the objects of the invention is to provide a structurehaving a maximum of the core and winding material efiectively employed together with such methods ofproducing said structure aswill result in an ar tide of greater durability than when made according to presentmethods.

Another object of the invention isto provide a commutator the segments of'which are composed of integral ends of the conductor bars.

Another object of the invention is provide conducting loops which may be economically madefrombars of such cross section as to be suitable for commutator segments.

".2 Another object of the invention is to provide awinding and commutator in continu ous circult without soldered, brazed or welded ointsthere1n.

Other objects Wlll become apparent to those 2 skilled in the art as the invention is described in detail and reference is made to the drawingswherein Fig. Ishows a length of bar stock which has been cut apart to form two conductor bars of different length and form.

Fig. 2 shows how the conductor bars are spaced apart in loop form prior to entry into a core.

Fig. '3 shows several loops Fig; 2 assembled with a portion of a core, the ends of the shorter conductor .bars being displaced away from the axis of the core whichpermitted the longer bars to be bent to loop form as shown. Fig. v4 shows the structureFig. 3 after the ends of the shorter conductor bars have been replaced to pair them with the longer ends to form commutator segments.

. Fig. 5 showsa core havingan ntegral com- 2 out hav ng the ends 2 1 1nterferewrththe ends 32 when bending is taking place the 90 inutator and winding assembled therewith and molded insulation binding them together space being left inthecore for thetsecond Winding. 1 Fig. 6 shows a completed double wound-armature having a winding of relatively-fine wire filling the'remaining space inth'e core 59 7 slots and a commutator connected .thereto.'.:

Similar numerals refer-to .similar parts thruout the several viewsn 1.

In carrying out my invention I prefers to use for the conductor bars ofthe coarser 5:; winding, stock ofwedge shaped cross sec- :1; tion, such as is commonly used to compose segments of a dynamo electric machine commutator. 1

In Fig. 1 is shown a length .of {such stock (30 which has been cut apart at 20, formingfrom S. r

the piece a conductor bar 21 having a beveled end 22, and a relatively longer and :difi'er ently shaped conductor bar:23, having an upwardy projectingend 24 beveled at25: and

26, the two conductorbars beingleftjoined together at the end 27. l A.

. After a length of stock is cut apaiti asin Fig. 1, it is bent as at 28 Fig. '2', the two conductor bars 21 and 23 thruout part of their lengths extending substantially parallel and spaced apart sufliciently to compose a turn of the winding. a Y 1;

In Fig. 3 I show a-portion :of a core v29 into which severalwinding turns :havebeen assembled and while the core show-n has semiclosed slots 30, 30 etc., the winding shown may be readily applied to cores having. slots that are entirely closed or entirely .open. The conductor bars in Fig.- 3 are showntozhave so been further bent, this time at 31, .31 etc., i

to complete the winding turns and wh'ile the bends at 31, 31 etc; are suchas to compose the turns of a lap winding,lit is. obvious I that had these bendsb eenmadeuin an op ip'osite direction the turnsof a wave winding would have been formed.

To permit bending as at 31, 31 3 withends 32 may be displaced outwardly from their true position relative to the core axis as shown. This displacement may be made in the loops Fig. 2 before they are endwisc entered. thru the slots 30, since slots 30 are intended to receive two separate windiand are therefore of greater depth than required by bars 21 and 23 in normal posi tion.

After the conductor bars 23 are bent, as in 31, 31 Fig. 3, the-shorter bars 21. are replaced {to their position nearerthe core axis, a, shown in Fig. 4, where they are arranged with an end 32 of an outer layer bar 21 circumferentially adjacent to an outwardly projecting end 24 of an inner layer bar 23, pairs thus formed serving not only to connect the turns of the winding in continuous circuit, but also forming of each pair a commutator segme Cases may arise however, where it is de able to use such a winding without nsn g the connecting ends as a commutator, in which case the outwardly projecting portion 24 of the bar 23 need not'be as long in proportion to the bar here shown. L shaped spacers 33, 33 etc., of mica or other insulating material may be placed between the several segments as shown, but must not be placed between anytwo ends comprising a segment.

One of the novel features of the invention resides in the manner of making the integral conducting and commutator parts hereinbcfore disclosed. When the upwardly projecting end 24 of bar 23 (see Fig. 1) is intended to form part of a commutator segment, it is desirable that it extend lengthwise of the bar sufiiciently for that purpose, and when so cut from a single bar the part remaining composing the conductor bar 21 will of necessity be'shorter than the bar 43. In Fig. 2 and Fig. 3 the portions 28 and 31 forming the leads or end connections between the two conducting bars'of a turn are composed entirely of the longer conducting bar and it is because of this manner of forming the turn that the two ends 24 and 32, Fig. 4, comprising a pair, can, when so desired, be brought to equal. distances from the end of the core in the completed winding, the bent portions 28 and 31 taking up the extra length of one bar of a turn over the other.

Cases may arise where the two bars of a turn are of such proportion as to length as to necessitate forming end connections at both ends from both bars, thelonger bar supplying a greater portion of such lead or end connection than the shorter, and while I show one form which the end connections may take it is obvious that these ends may be bent to any form or contour which will connect the spaced apart bars of a turn without interference of oneend connecting portion with another.

After all the slots of a core have been wound like the several slots shown in Fig.

i the assembled structure is preferably placed in a mold and insulating material molded thru and about the ends of the conductor bars to bind them together and form a commutator thereof.

In Fig. 5 I show cores with integral windings and commutatmrs so constructed, wherein 34L is the insulating material used as a bimling means. After completing the one independent winding, Fi 5 as disclosed, the spaces 35, 35, etc., (see Fig. 4;), remaining in the slots 30 of core 29 may be used for another winding which will usually be composed of a number of turns of relatively line wire 36 wound in'coils in continuous circuit and. tapped at intervals and connected to the bars of a separate commutator 37, as shown in Fig. 6. This separate commutator 37 may be mounted at the end shown or it may surround the coarscr winding and be fastened thereto at the same end as the comn'iutator of the first winding, and while I show the second winding to be composed of coils of many turns of relatively fine wire, it may be composed of coils of fewer turns of coarser wire or of coils of several turns ofinsulated strip stock.

lVliile I have herein shown and described one embodiment of my invention, it is obvious that many changes in the details of the structure may be made without departing from the spirit of the invention, the scope of which I aim to define in the following Wherein I claim 1. The method of winding a double wound armature which consistsof splitting lengths of commutator bar stock from a point near one end to apoint near the other, thence outwardly through one edge so as to provide I long and short legs, bending thelong legs sidewise to take up substantially half of the excess length of the long over the short legs, bending the short legs outwardly, inserting a plurality of the bars endwise thru the winding apertures, bending the long legs sidewise to take up the remainder of their excess length, bending the short legs inwardly, binding together pairs of ends, each pair composed of an end of a short leg and an end of a long leg, to compose commutator segments and the segments together to compose a comnniitator, placing a relatively fine wire winding in the space remaining in the pertures and connecting it to a separate commutator. i

2. A double wound dynamo electric machine armature comprising, a magnetizable core containing a plurality of radially deep winding apertures, a bar winding arranged in two concentric layers .in the inner half of said apertures, said winding being composed of a plurality of loops each comprising a single piece of metal having two spaced apart legs, one leg being a conductor bar of lfIO theinner layer and the other leg being a v conductor bar of the outer 1ayer,;the conduc- In testimony whereof I hereunto subscribe o my name. I

VINCENT G. APPLE. 

